Plasma Display Device

ABSTRACT

A plasma display device includes a plasma display panel  11  that has a front substrate including a plurality of display electrodes arranged thereon and a rear substrate having data electrodes arranged thereon to cross the display electrodes, the front substrate and the rear substrate facing each other so as to form a discharge space, and chassis member  20  that holds plasma display panel  11  on a front side and has a driving circuit block for driving plasma display panel  11  on a rear side. Chassis member  20  has base plate  36  that is divided into a plurality of base metal plates  36   a   , 36   b , and  36   c , to which plasma display panel  11  is attached, and metal plates  37  and  38  that couple the plurality of base metal plates  36   a   , 36   b , and  36   c  together.

TECHNICAL FIELD

The invention relates to a plasma display device that uses a plasmadisplay panel (hereinafter, referred to as ‘PDP’) as a display device.

BACKGROUND ART

A PDP for a plasma display device is roughly classified into an AC typeand a DC type in terms of driving, and also classified into a surfacedischarge type and an opposing discharge type in terms of discharging.In view of high definition, large screen, and ease of manufacturing, atpresent, a three-electrode surface discharge type PDP is becomingprevalent.

The surface discharge type PDP is composed of a pair of substrateshaving at least a transparent front surface that are disposed to faceeach other so as to form a discharge space therebetween. Barrier ribsare disposed on the substrates to partition the discharge space into aplurality of discharge spaces. Then, electrode groups are disposed onthe substrates so as to cause discharge in the discharge spacespartitioned by the barrier ribs. Phosphor that emits red, green, andblue light during discharge is provided so as to form a plurality ofdischarge cells. Visible light is emitted from red, green, and bluedischarge cells by exciting the phosphor with vacuum ultraviolet rayshaving a short wavelength generated during discharge, thereby performingcolor display.

A plasma display device using such a PDP features a higher displayspeed, a wider view angle, easier production of a large screen, and ahigher display quality by self-luminescence, compared with an imagedisplay device using a liquid crystal panel. Because of the features,the PDP is getting a particular attention in flat panel displays and isused for various applications as a display device for public places andas a display device at home for enjoying a large screen image at home.

In such a plasma display device, the PDP primarily formed of glass isheld on a front side of a metal chassis member formed of aluminum or thelike. Further, on a rear side of the chassis member, a circuit boardthat constitutes a driving circuit for causing the PDP to emit light isdisposed, thereby constituting a module. This example is disclosed inJapanese Patent Unexamined Publication No. 2003-131580.

In the plasma display device, since the large screen is easily realized,in recent years, the products having a size of 65 inches or more havebeen manufactured and sold. Further, with the demands for higherdefinition display, products of definition 768×1366 as well as productsof higher definition 1080×1920 have been manufactured.

As such, as the large screen and high definition of the plasma displaydevice are advanced, it is necessary to reform the parts constitutingthe products. In particular, with the advancement of the large screen ofthe PDP, a chassis member or a front protective cover for holding alarge-screen PDP may be increased in weight in order to secure strength.

DISCLOSURE OF THE INVENTION

According to an aspect of the invention, a plasma display deviceincludes a PDP that has a front substrate having a plurality of displayelectrodes arranged thereon and a rear substrate having data electrodesarranged thereon to cross the display electrodes, the front substrateand the rear substrate facing each other so as to form a dischargespace, and a chassis member that holds the PDP on a front side and has adriving circuit block for driving the PDP on a rear side. The chassismember has a base plate that has a plurality of divided base metalplates, to which the PDP is attached, and metal plates that couple theplurality of base metal plates together.

According to the invention, even if the PDP has a larger screen, achassis member having predetermined strength can be easily obtained, andthus a plasma display device suitable for a large screen can beobtained.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing essential parts of a PDP, which isused for a plasma display device, in an embodiment of the invention.

FIG. 2 is a diagram showing the electrode arrangement of the PDP.

FIG. 3 is a circuit block diagram of the plasma display device.

FIG. 4 is a waveform chart showing driving voltage waveforms that areapplied to individual electrodes of the PDP.

FIG. 5 is a perspective view showing the configuration of a rear side ofthe plasma display device.

FIG. 6 is a plan view showing an example of the arrangement of theplasma display device as viewed from the rear side.

FIG. 7 is a cross-sectional view showing the sectional structure ofessential parts of the plasma display device.

FIG. 8 is a perspective view showing an example of a chassis member ofthe plasma display device.

FIG. 9 is a perspective view showing an example of a front protectivecover of the plasma display device.

FIG. 10 is a perspective view showing an example of a stand for holdinga large plasma display device to self-stand.

FIG. 11 is a perspective view of a large plasma display device as viewedfrom a rear side.

FIG. 12 is a plan view showing the structure of essential parts of astand shown in FIG. 10.

FIG. 13 is a cross-sectional view showing the structure of essentialparts in a state where a plasma display device is attached to a standshown in FIG. 10.

REFERENCE MARKS IN THE DRAWINGS

-   -   11: PDP    -   20: CHASSIS MEMBER    -   34: FRONT PROTECTIVE COVER    -   35: BACK COVER    -   35 a, 35 b, 35 c, 35 d: PARTITION COVER    -   36: BASE PLATE    -   36 a, 36 b, 36 c, 37, 38: METAL PLATE    -   39, 40: HORIZONTAL ANGLE    -   41: VERTICAL ANGLE    -   42: HANGING BRACKET    -   44: FRONT FRAME    -   44 a: FRONT FRAME OPENING    -   45: PROTECTIVE PLATE    -   46: PROTECTIVE PLATE PRESSING BRACKET    -   47: REINFORCING FRAME    -   47 a: REINFORCING FRAME OPENING

PREFERRED EMBODIMENTS FOR CARRYING OUT THE INVENTION

Hereinafter, a plasma display device in an embodiment of the inventionwill be described with reference to FIGS. 1 to 8.

Embodiments

First, the structure of a PDP in a plasma display device will bedescribed with reference to FIG. 1. As shown in FIG. 1, the PDP hasfront substrate 1 and rear substrate 2, formed of glass, which face eachother so as to form a discharge space therebetween. On front substrate1, a plurality of scanning electrodes 3 and a plurality of sustainelectrodes 4 are formed in parallel with each other in pairs as displayelectrodes. Dielectric layer 5 is formed to cover scanning electrodes 3and sustain electrodes 4, and protective layer 6 is formed on dielectriclayer 5.

On rear substrate 2, a plurality of data electrodes 8 are provided to becovered with insulator layer 7, and lattice-shaped barrier rib 9 isprovided on insulator layer 7. Phosphor layer 10 is provided on thesurface of insulator layer 7 and the side surface of barrier rib 9.Front substrate 1 and rear substrate 2 are disposed to face each othersuch that scanning electrodes 3, and sustain electrodes 4 and dataelectrodes 8 cross each other. In the discharge space that is formedbetween the substrates, a mixed gas of neon and xenon is filled as adischarge gas. The structure of the PDP is not limited to theabove-described structure. For example, stripe-shaped barrier ribs maybe provided.

FIG. 2 is a diagram showing the electrode arrangement of the PDP. In arow direction, n scanning electrodes SC1 to SCn (scanning electrodes 3of FIG. 1) and n sustain electrodes SU1 to SUn (sustain electrodes 4 ofFIG. 1) are arranged, and in a column direction, m data electrodes D1 toDm (data electrodes 8 of FIG. 1) are arranged. A discharge cell isformed in a portion where a pair of scanning electrode SCi and sustainelectrode SUi (where i=1 to n) and one data electrode Dj (where j=1 tom) cross each other. In the discharge space, m×n discharge cells areformed.

FIG. 3 is a circuit block diagram of a plasma display device, which usesthe PDP. The plasma display device includes PDP 11, image signalprocessing circuit 12, data electrode driving circuit 13, scanningelectrode driving circuit 14, sustain electrode driving circuit 15,timing generating circuit 16, and power supply circuit (not shown).

Image signal processing circuit 12 converts image signal Sig into imagedata for each subfield. Data electrode driving circuit 13 converts theimage data for each subfield into signals corresponding to dataelectrodes D1 to Dm, and drives data electrodes D1 to Dm. Timinggenerating circuit 16 generates various timing signals on the basis ofhorizontal synchronizing signal H and vertical synchronizing signal Vand supplies the generated timing signals to the individual drivingcircuit blocks. Scanning electrode driving circuit 14 supplies drivingvoltage waveforms to scanning electrodes SC to SCn on the basis of thetiming signals, and sustain electrode driving circuit 15 suppliesdriving voltage waveforms to sustain electrodes SU1 to SUn on the basisof the timing signals. Each of scanning electrode driving circuit 14 andsustain electrode driving circuit 15 has sustain pulse generating unit17.

Next, the driving voltage waveforms for driving PDP 11 and theoperations thereof will be described with reference to FIG. 4. FIG. 4 isa diagram showing driving voltage waveforms that are applied to theindividual electrodes of the PDP.

In the plasma display device of this embodiment, one field is dividedinto a plurality of subfields, and each of the subfields has aninitialization period, a write period, and a sustain period.

In the initialization period of the first subfield, data electrodes D1to Dm and sustain electrodes SU1 to SUn are kept to 0 (V), and a rampvoltage that gradually rises from voltage Vi1 (V) not more than adischarge start voltage to voltage Vi2 (V) more than the discharge startvoltage is applied to scanning electrodes SC1 to SCn. If so, first weakinitialization discharge is generated in all the discharge cells.Accordingly, a negative wall voltage is accumulated on scanningelectrodes SC1 to SCn and a positive wall voltage is accumulated onsustain electrodes SU1 to SUn and data electrodes D1 to Dm. Here, thewall voltage on the electrode means a voltage that is generated by wallcharges accumulated on the dielectric layer and the phosphor layercovering the electrode.

Subsequently, sustain electrodes SU1 to SUn are kept to positive voltageVh (V), and a ramp voltage that gradually falls from voltage Vi3 (V) tovoltage Vi4 (V) is applied to scanning electrodes SC1 to SCn. If so,second weak initialization discharge is generated in all the dischargecells. Accordingly, a wall voltage between scanning electrodes SC to SCnand sustain electrodes SU1 to SUn is weakened, and a wall voltage ondata electrodes D1 to Dm is adjusted to a value suitable for a writeoperation.

In a subsequent write period, scanning electrodes SC1 to SCn are kept toVr (V) once. Next, negative scanning pulse voltage Va (V) is applied tofirst row scanning electrode SC1, and positive write pulse voltage Vd(V) is applied to a data electrode Dk (where k=1 to m) of dischargecells to be displayed in the first row among the data electrodes D1 toDm. At this time, a voltage at an intersection of data electrode Dk andscanning electrode SC1 is obtained by adding the wall voltage on dataelectrode Dk and the wall voltage on scanning electrode SC1 to externalapplication voltage (Vd-Va) (V) and exceeds the discharge start voltage.If so, write discharge is generated between data electrode Dk andscanning electrode SC1 and between sustain electrode SU1 and scanningelectrode SC1. Accordingly, a positive wall voltage is accumulated onscanning electrode SC of the corresponding discharge cell, and anegative wall voltage is accumulated on sustain electrode SU1. Further,the negative wall voltage is also accumulated on data electrode Dk.

In such a manner, write discharge is generated in the discharge cells tobe displayed in the first row, and a write operation is performed so asto accumulate the wall voltage on the individual electrodes. Meanwhile,a voltage at each of intersections of data electrodes D1 to Dm, to whichwrite pulse voltage Vd (V) is not applied, and scanning electrode SC1does not exceed the discharge start voltage, and thus the writedischarge is not generated. The write operation is performed to thedischarge cells of the n-th row, and then the write period ends.

In the subsequent sustain period, positive sustain pulse voltage Vs (V)is applied to scanning electrodes SC1 to SCn as a first voltage, and aground potential, that is, 0 (V) is applied to sustain electrodes SU1 toSUn as a second voltage. At this time, in the discharge cells wherewrite discharge is generated, a voltage between scanning electrode SCiand sustain electrode SUi is obtained by adding the wall voltage onscanning electrode SCi and the wall voltage on sustain electrode SUi tosustain pulse voltage Vs (V) and exceeds the discharge start voltage.Then, sustain discharge is generated between scanning electrode SCi andsustain electrode SUi, and the phosphor layer emits light by ultravioletrays generated during sustain discharge. Further, a negative wallvoltage is accumulated on scanning electrode SCi, and a positive wallvoltage is accumulated on sustain electrode SUi. At this time, thepositive wall voltage is also accumulated on data electrode Dk.

In the discharge cells where write discharge is not generated in thewrite period, sustain discharge is not generated, and thus the wallvoltage at the end of the initialization period is kept. Subsequently, 0(V) as the second voltage is applied to scanning electrodes SC1 to SCn,and sustain pulse voltage Vs (V) as the first voltage is applied tosustain electrodes SU1 to SUn. If so, in the discharge cells wheresustain discharge is generated, a voltage between sustain electrode SUiand scanning electrode SCi exceeds the discharge start voltage.Accordingly, sustain discharge is generated between sustain electrodeSUi and scanning electrode SCi again. Then, a negative wall voltage isaccumulated on sustain electrode SUi and a positive wall voltage isaccumulated on scanning electrode SCi.

Similarly, sustain pulses are alternately applied to scanning electrodesSC1 to SCn and sustain electrodes SU1 to SUn in a number set accordingto a luminance weight. Then, in the discharge cells where writedischarge is generated in the write period, sustain discharge iscontinuously performed. In such a manner, a sustain operation in thesustain period ends.

The operations of the initialization period, the write period, and thesustain period in the subsequent subfield are substantially the same asthose in the first subfield, and the descriptions thereof will beomitted.

FIG. 5 shows an example of the overall configuration of a plasma displaydevice into which a PDP having the above-described structure isincorporated. FIG. 6 shows an example of the arrangement of drivingcircuit blocks as viewed from a rear side. FIG. 7 shows a sectionalstructure of the plasma display device.

Referring to the drawings, on a front side of chassis member 20 as aholding plate as well as a metal heat radiation plate, PDP 11 is adheredto chassis member 20 with a heat radiation sheet 21 interposedtherebetween by an adhesive or the like and then held. Further, as shownin FIG. 6, a plurality of driving circuit blocks for driving PDP 11 todisplay are disposed on the rear side of chassis member 20. Chassismember 20 and PDP 11 constitute a module as a single body.

Heat radiation sheet 21 holds PDP 11 by adhering PDP 11 to the frontside of chassis member 20 and efficiently conducts heat generated in PDP11 to chassis member 20 so as to perform heat radiation. The thicknessof heat radiayion sheet 21 is approximately 1 mm to 2 mm. Examples ofheat radiation sheet 21 include an insulating heat radiation sheet,which is obtained by adding a filler to a synthetic resin material, suchas acryl or urethane, silicon resin, or rubber, in order to increaseheat conductivity, a graphite sheet, and a metal sheet. Alternatively,the heat radiation sheet may have adhesiveness, and PDP 11 may beadhered to chassis member 20 only with the heat radiation sheet and thenheld. Further, the heat radiation sheet may not have adhesiveness, andPDP 11 may be adhered to chassis member 20 using an additionaldouble-sided adhesive tape.

At both edges of PDP 11, flexible wiring boards 22 are provided asdisplay electrode wiring members, which are connected to lead portionsof scanning electrodes 3 and sustain electrodes 4. Flexible wiringboards 22 are led to the rear side of chassis member 20 through theouter circumference of chassis member 20, and then connected to drivingcircuit block 23 of scanning electrode driving circuit 14 and drivingcircuit block 24 of sustain electrode driving circuit 15 throughconnectors.

Meanwhile, at lower and upper edges of PDP 11, a plurality of flexiblewiring boards 25 are provided as data electrode wiring members, whichare connected to lead portions of data electrodes 8. Flexible wiringboards 25 are electrically connected to a plurality of data drivers 26of data electrode driving circuit 13. Further, flexible wiring boards 25are led to the rear side of chassis member 20 through the outercircumference of chassis member 20, and then electrically connected todriving circuit blocks 27 of data electrode driving circuit 13, whichare disposed at lower and upper portions on the rear side of chassismember 20.

Control circuit block 28 is substantially disposed in the centralportion of chassis member 20. Control circuit block 28 converts imagedata into image data signals according to the number of pixels of thepanel 11 on the basis of an image signal transmitted from an inputsignal circuit block 29 having an input terminal portion, to which aconnection cable for connection to an external apparatus, such as atelevision tuner, is detachably connected, and supplies the convertedimage data signals to driving circuit block 27 of data electrode drivingcircuit 13. In addition, control circuit block 28 generates a dischargecontrol timing signal, and supplies the generated discharge controltiming signal to driving circuit block 23 of scanning electrode drivingcircuit 14 and driving circuit block 24 of sustain electrode drivingcircuit 15, thereby performing display driving control, such asgray-scale control.

Power supply block 30 supplies power to the individual circuit blocks.Similarly to control circuit block 28, power supply block 30 issubstantially disposed in the central portion of chassis member 20, andthen a commercial power supply voltage is supplied through a connector,on which a power cable (not shown) is mounted. Driving circuit blocks23, 24, and 27, control circuit block 28, input signal circuit block 29,and power supply block 30 are fixed to boss portions provided on therear side of chassis member 20 by screws or the like.

Around driving circuit blocks 23 and 24, cooling fan 31 is disposed tobe held by an angle 32, such that driving circuit blocks 23 and 24 arecooled by wind from cooling fan 31. In addition, in the upper portion ofchassis member 20, cooling fan 33 is provided to cool driving circuitblock 27 of data electrode driving circuit 13 disposed in the upperportion and to by cool the inside of the device generating an air flowfrom the lower portion toward the upper portion inside the entire deviceon the rear side of chassis member 20.

As shown in FIG. 7, the module having the above-described structure isaccommodated in a casing having front protective cover 34 disposed onthe front side of PDP 11 and a metal back cover 35 disposed on the rearside of chassis member 20, thereby completing a plasma display device.As shown in FIG. 5, back cover 35 is provided with a plurality of airholes 60 that discharge heat generated in the module to the outside.

Next, the configuration of chassis member 20, and front protective cover34 and back cover 35 constituting the casing in the plasma displaydevice according to the invention will be described in detail withreference to FIGS. 5 and 7 to 9.

First, chassis member 20 will be described in detail with reference toFIGS. 5 and 8. FIG. 8 is an exploded perspective view of chassis member20.

As shown in FIG. 8, chassis member 20 includes base plate 36 that has aplurality (in the drawings, three) of base metal plates 36 a, 36 b, and36 c, such as an aluminum plate, to which PDP 11 is attached, metalplates 37 and 38 that are fixed to overlap base plate 36 and couple basemetal plates 36 a, 36 b, and 36 c together, and a plurality ofrectangular horizontal angles 39 and 40 and vertical angles 41 thatreinforce horizontal and vertical strength of base plate 36.

Metal plates 37 are composed of an aluminum plate, and fixed to overlapupper and lower edges on the rear side of base plate 36 to couple basemetal plates 36 a, 36 b, and 36 c, thereby reinforcing base plate 36.Metal plates 38 are also composed of an aluminum plate, and are fixed tooverlap edges on the rear sides of left and right base metal plates 36 aand 36 c of base plate 36, thereby reinforcing base plate 36.

Two horizontal angles 39 are fixed to overlap metal plates 37 so as toreinforce horizontal strength of base plate 36. In addition, onehorizontal angle 40 is fixed to overlap base plate 36 so as to couplebase metal plates 36 a, 36 b, and 36 c together and to reinforcehorizontal strength of base plate 36.

Three vertical angles 41 are fixed to bridge two horizontal angles 39and cross them at right angles, thereby reinforcing vertical strength ofbase plate 36. At upper ends of three vertical angles 41 fixed in thevertical direction, hanging brackets 42 are respectively fixed so as tohang and transport the plasma display device. With the hanging brackets42, a large plasma display device having a large screen is easily hungand transported. Further, middle portions of three vertical angles 41are fixed to horizontal angles 40 fixed to base plate 36 throughcoupling brackets 43.

Chassis member 20 includes base plate 36 having a plurality of basemetal plates 36 a, 36 b, and 36 c, and metal plates 37 and 38 that arefixed to overlap base plate 36 and couple base metal plates 36 a, 36 b,and 36 c together. Accordingly, chassis member 20 that holds PDP 11having a larger screen can be easily realized without performing aprocessing, such as press molding, on base plate 36.

In particular, when forming chassis member 20 that holds PDP 11 having alarge screen of approximately 100 inches by processing and molding onethin metal plate, it is difficult to secure flatness of the frontsurface of chassis member 20, to which PDP 11 is attached. For thisreason, a thick metal plate is processed to form chassis member 20, andthen chassis member 20 may be increased in weight.

In the invention, base plate 36 of chassis member 20, to which PDP 11 isattached, is divided into a plurality of base metal plates 36 a, 36 b,and 36 c, and base metal plates 36 a, 36 b, and 36 c are coupled bymetal plates 37 and 38 together. For this reason, flatness of thesurface, to which PDP 11 is attached, is easily secured, and thuslight-weight chassis member 20 can be easily obtained.

Next, the configuration of front protective cover 34 and back cover 35constituting the casing will be described in detail with reference toFIGS. 5, 7, and 9. FIG. 9 is an exploded perspective view of frontprotective cover 34.

As shown in FIGS. 7 and 9, front protective cover 34 includes frontframe 44 that is formed of resin or a metal and has front frame opening44 a, through which an image display region on the front side of PDP 11is exposed, and protective plate 45 that is attached to front frameopening 44 a of front frame 44 and is formed of glass provided with anoptical filter or an unnecessary radiation suppressing film forsuppressing unnecessary radiation of electromagnetic waves. Protectiveplate 45 is attached to front frame 44 by sandwiching the periphery ofprotective plate 45 with the edge of front frame opening 44 a of frontframe 44 and protective plate pressing brackets 46 through reinforcingframe 47.

Reinforcing frame 47 is masked such that a non-display region of PDP 11is not caught by a viewer. Reinforcing frame 47 is provided to improveexterior design of the plasma display device. In addition, reinforcingframe 47 is formed of resin or a metal to have reinforcing frame opening47 a corresponding to the display region of PDP 11. The size ofreinforcing frame 47 is set such that the edge of reinforcing frameopening 47 a is exposed through front frame opening 44 a of front frame44. Front surface of reinforcing frame 47 is subjected to a glosstreatment or a satin finish treatment.

In front protective cover 34, mounting brackets 48 and 49 are providedto attach protective plate pressing brackets 46 to front frame 44, andto attach front frame 44 to horizontal angles 39 of chassis member 20.As shown in FIG. 7, by attaching mounting bracket 48 to front frame 44with screws 50 and attaching mounting bracket 48 to chassis member 20through mounting bracket 49, front protective cover 34 is attached tochassis member 20. Accordingly, the non-display region of PDP 11 can bereliably masked, and protective plate 45 can be reliably fixed to frontprotective cover 34.

Next, as shown in FIGS. 5 and 7, back cover 35 is divided into aplurality of parts (in the drawings, four parts), and a plurality ofpartition covers 35 a to 35 d are attached to vertical angles 41 ofchassis member 20 and protective plate pressing brackets 46 of frontprotective cover 34 by screws (not shown).

As such, in the invention, front protective cover 34 includes frontframe 44 that is formed of resin or a metal to have front frame opening44 a, through which the image display region on the front side of PDP 11is exposed, and protective plate 45 that is attached to front frameopening 44 a of front frame 44 and formed of glass provided with anoptical filter or an unnecessary radiation suppressing film forsuppressing unnecessary radiation of electromagnetic waves. In addition,protective plate 45 is attached to front frame 44 by sandwiching theperiphery thereof with the edge of front frame opening 44 a of frontframe 44 and protective plate pressing brackets 46 through reinforcingframe 47. That is, in addition to front frame 44, additional reinforcingframe 47 is provided. For this reason, front protective cover 34 canhave enough strength to protect the front surface of PDP 11, withoutincreasing the thickness of front frame 44.

In particular, with the large screen of the PDP, the external size offront frame 44 and the area of front frame opening 44 a are increased.In this case, if the thickness of front frame 44 is the same, strengthof front frame 44 is lowered. However, by additionally providingreinforcing frame 47 as a trim inside front frame 44 a, front protectivecover 34 can have enough strength.

In the invention, back cover 35 is divided into a plurality of parts andattached to reinforcing vertical angles 41 of chassis member 20, andback cover 35 and front protective cover 34 constitute the casing. Forthis reason, a casing of a plasma display device using large-screen PDP11 can be simply formed.

Next, a mounting structure on a stand that holds a large plasma displaydevice, for example, the plasma display device of the invention, toself-stand will be described with reference to FIGS. 10 to 13.

FIG. 10 is a perspective view showing an example of a stand that holds alarge plasma display device to self-stand. FIG. 11 is a rear view of theabove-described large plasma display device as viewed from back cover 35side. FIG. 12 is a plan view showing the structure of essential parts ofthe stand shown in FIG. 10. FIG. 13 is a cross-sectional view showingthe structure of essential parts in a state the plasma display device isattached to the stand shown in FIG. 10.

As shown in FIG. 10, stand 51 is configured by attaching two rectangularmetal supports 54 to carrier 53 having casters 52. Supports 54 areattached to carrier 53 upright by joining metal fixing plates 55 withcarrier 53 and supports 54 by welding or the like. Further, FIG. 10 showvertical angles 41 in the plasma display device to assist understandingof positional relationship between stand 51 and the plasma displaydevice.

On a surface of each support 54 of stand 51, to which the plasma displaydevice is attached, as shown in FIGS. 10 and 12, U-shaped notch 56 isprovided in the uppermost portion, and keyhole-shaped engagement hole 57is provided in the middle portion.

On the rear side of the plasma display device, as shown in FIG. 11, fourcylindrical engagement blocks 58, each having small-diameter portion 58a in the middle portion, passes through back cover 35 and are screwed tovertical angles 41. Further, engagement blocks 58 are fixed to twovertical angles 41 on both sides among three vertical angles 41 shown inFIG. 5. Engagement blocks 58 are fitted into notches 56 and engagementholes 57 provided in supports 54 of stand 51, such that small-diameterportions 58 a are engaged with notches 56 and engagement holes 57.

That is, according to the mounting structure of the plasma displaydevice shown in FIGS. 10 to 13, as shown in FIG. 11, small-diameterportions 58 a of engagement blocks 58 are engaged with notches 56 andengagement holes 57, such that the plasma display device is temporarilyfixed to supports 54 of stand 51. Subsequently, as shown in FIGS. 10 and13, supports 54 of stand 51 and vertical angles 41 of the plasma displaydevice are fixed to each other by fixing screws 59. In such a manner,the plasma display device can be easily attached to stand 51.

INDUSTRIAL APPLICABILITY

As described above, the invention is useful to provide a large-screenplasma display device.

1. A plasma display device comprising: a plasma display panel that has afront substrate having a plurality of display electrodes arrangedthereon and a rear substrate having data electrodes arranged thereon tocross the display electrodes, the front substrate and the rear substratefacing each other so as to form a discharge space therebetween; and achassis member that holds the plasma display panel on a front side andhas a driving circuit block for driving the plasma display panel on arear side, wherein the chassis member has a base plate that has aplurality of divided base metal plates, to which the plasma displaypanel is attached, and metal plates that couple the plurality of basemetal plates together.
 2. The plasma display device of claim 1, whereinthe chassis member has horizontal angles that reinforce horizontalstrength, and vertical angles that are attached to the horizontal anglesand reinforce vertical strength.
 3. The plasma display device of claim2, wherein hanging brackets are fixed at upper ends of the verticalangles of the chassis member.
 4. A plasma display device comprising: aplasma display panel that has a front substrate having a plurality ofdisplay electrodes arranged thereon and a rear substrate having dataelectrodes arranged thereon to cross the display electrodes, the frontsubstrate and the rear substrate facing each other so as to form adischarge space; a chassis member that holds the plasma display panel ona front side and has a driving circuit block for driving the plasmadisplay panel on a rear side; and a front protective cover and a backcover that constitute a casing for accommodating a module of the chassismember and the plasma display panel as a single body, wherein thechassis member has a base plate that has a plurality of divided basemetal plates, to which the plasma display panel is attached, and metalplates that couple the plurality of base metal plates together.
 5. Theplasma display device of claim 4, wherein the back cover has a pluralityof divided partition covers, and the partition covers are attached tothe chassis member.
 6. The plasma display device of claim 5, wherein thechassis member has horizontal angles that reinforce horizontal strength,and vertical angles that are attached to the horizontal angles andreinforce vertical strength, and the partition covers of the back coverare respectively attached to the vertical angles.